COLUMBIA GLACIER, ALASKA
June 23, 2006
The calving face of Columbia Glacier as of June, 2006. Since 1984, the glacier has retreated ten miles (17 km.), a process caused by interaction between global warming and glacier dynamics. The mountainside in the middle distance has a trimline revealing that the glacier was 1300 ft. (400 m.) thicker at its maximum in 1984. (Greenish snow-covered vegetation is above the trimline and uniform grey rock is below the trimline.)
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